Simple pseudo-terminal app

gistfile1.h

#include <stdio.h>
#include <stdlib.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>

char *path = "/home/aragaer/pts";
char linkname[80] = "";

void sigint(int sig) {
    unlink(linkname);
    exit(0);
}

int reopen_pseudo(int fd) {
    char buf[80];
    if (fd < 0) { // first open
        int i, res;
        struct stat tmp;
        for (i = 0; i < 10; i++) {
            sprintf(linkname, "%s%d", path, i);
            res = stat(linkname, &tmp);
            if (res == -1 && errno == ENOENT)
                break;
        }

        if (i == 10) {
            printf("No free links found\n");
            return -1;
        }
    } else {
        unlink(linkname);
        close(fd);
    }

    fd = open("/dev/ptmx", O_RDWR | O_NOCTTY);
    if (fd == -1)
        return fd;

    ptsname_r(fd, buf, sizeof buf);
    symlink(buf, linkname);

    unlockpt(fd);
    return fd;
}

int main() {
    int fd = -1;
    char ch;

    signal(SIGINT, sigint);

    while ((fd = reopen_pseudo(fd)) > 0) {
        while (read(fd, &ch, 1) > 0) {
            printf("%c", ch);
            fflush(stdout);
        }
        printf("!\n");
    }
}